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Dissertations / Theses on the topic 'Methoxy Phenol'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Reinaud, Olivia. "Nouvelles methodes d'alkylation regioselective d'orthoquinones originales : synthese de differentes classes de produits naturels quinoniques." Paris 6, 1987. http://www.theses.fr/1987PA066200.

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2

Wasser, Christian. "Synthese de derives phenoliques et etude de leur proprietes hypopigmentantes." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13191.

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Ce memoire presente les syntheses d'acyl-2 methoxy-4 phenols (a) d'alkyl-2 methoxy-4 phenols (b), d'alkyl-3 methoxy -4phenols (c), d'alkoxy-4 phenols (d) d'acide (hydroxy-4' phenyl)-3 methyl-2 propionique (e), d'acide (hydroxy-4' phenyl)-3 hydroxy-2 propionique, d'hydroxy-7 carboxy-3 tetrahydro-1,2,3,4 isoquinoleine et d'acide hydroxy-4 phenylpropargylique(f). L'etude "in vivo" (cobayes) et "in vitro" des proprietes hypopigmentantes des composes a, b, c, d, e et f. L'etude "in vivo" et "in vitro" des proprietes hypopigmentantes de substances naturelles : arbutine, luteoline, abscissine

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3

Sauret-Ignazi, Ginette. "Métabolisme du gai͏̈acol par un moraxella sp : étude d'un nouveau cytochrome P-450 bactérien." Grenoble 1, 1988. http://www.theses.fr/1988GRE10084.

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4

Bassey, E. N. "The extraction of phenols from ammoniacal liquors." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372179.

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5

Kontoudakis, Nikolaos. "Grape phenolic maturity; determination methods and consequences on wine phenolic composition." Doctoral thesis, Universitat Rovira i Virgili, 2010. http://hdl.handle.net/10803/8687.

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El objetivo de esta tesis ha sido abordar un estudio sobre la madurez fenólica de las uvas tintas, su influencia sobre la composición fenólica de los vinos y sus implicaciones sensoriales, así como sobre la aplicación de algunos sistemas para compensar la falta o exceso de madurez de las uvas. Se comparó la eficacia de 3 métodos para determinar la madurez fenólica (Glories, ITV, Cromoenos) y la influencia de la heterogeneidad en la madurez fenólica de la uva en el momento óptimo de cosecha. Una vez obtenidos estos objetivos se estudió la posibilidad de aprovechamiento de uva verde procedente

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6

Kigabo, Faustin. "Synthese de composes aromatiques par piegeage d'ions carbonium en milieu acide ou superacide." Poitiers, 1987. http://www.theses.fr/1987POIT2261.

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7

Rincon, Guillermo J. "Photocatalytic Mineralization of Phenol on Fluidized Titanium Oxide-Coated Silica Gel." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2009.

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A bench-scale tubular reactor with recirculation was built in order to study the efficiency of the photocatalytic oxidation of phenol on fluidized titanium oxide-coated silica gel beads. A UV-C lamp placed along the central vertical axes of the reactor was used as source of photons. A bed of silica gel beads was fluidized by means of fluid recirculation and forced to follow upward helical flow around the lamp. Anatase was successfully synthetized on silica gel particles of average diameters 224, 357 and 461 µm, as confirmed by scanning electron micrographs, through a sol-gel technique using a

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8

Pimentel, Marcio. "Oxidation of phenol and cresol by electrochemical advanced oxidation method in homogeneous medium : application to treatment of a real effluent of aeronautical industry." Phd thesis, Université Paris-Est, 2008. http://tel.archives-ouvertes.fr/tel-00481961.

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The present work verified the efficiency of electro-Fenton to destroy phenolic compounds present in Stripping Aircraft Wastewater. This research aimed to elucidate the influence of the catalyst nature, its concentration and of electric current density in efficiency of electro-Fenton process using an indivisible cell with a carbon felt cathode and platinum or borod doped diamond anodes. The experiments compared the effect of these variables to destroy phenol, cresols and their intermediates. The compounds and many intermediates formed were identified in High Perfomance Liquid Chromatograph and

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9

Vasco, Catalina. "Phenolic compounds in Ecuadorian fruits /." Uppsala : Dept. of Food Science, Swedish University of Agricultural Sciences, 2009. http://epsilon.slu.se/200954.pdf.

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10

Afonso, Adilson Pires 1955. "Projeto de processos de separação de sistemas complexos." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266188.

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Orientador: Maria Regina Wolf Maciel<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica<br>Made available in DSpace on 2018-08-07T04:13:19Z (GMT). No. of bitstreams: 1 Afonso_AdilsonPires_D.pdf: 2963967 bytes, checksum: 74c2f52074d8664fff323f72dc8f5730 (MD5) Previous issue date: 2005<br>Resumo: O processo de separação de misturas homogêneas e não ideais é um problema comum nas indústrias. A separação de misturas complexas pode ser realizada a baixa pressão, para evitar a degradação de componentes sensíveis ou ainda, com a utilização de destilação com rea

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11

Cooper, Mark Thomas. "A chromatographic method for detecting phenolic metabolites of carbosulfan in urine." Thesis, Queensland University of Technology, 1989. https://eprints.qut.edu.au/35977/1/35977_Cooper_1989.pdf.

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The inability of the conventional blood cholinesterase test to reliably detect carbamate pesticide poisoning in humans prompted the investigation of an alternative surveillance method. Rapid, micro-scale sample treatment procedures were developed to extract the phenolic metabolites of carbosulfan from urine, convert these compounds to their dinitrophenyl ether derivatives and determine their concentrations quantitatively by nitrogen selective gas-liquid chromatography. This method was capable of detecting micro-gram levels of metabolites and performed to an accuracy of<+/ 10% and pre

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12

Essien, Herbert Ebiom. "Synthesis And Opioid-Related Activities Of Some Cis - And Trans -3-(Mono- Or Dialkylamino)-7-(Methoxy Or Hydroxy)-1-Phenyl-1,2,3,4-Tetrahydronaphthalenes." Scholarly Commons, 1986. https://scholarlycommons.pacific.edu/uop_etds/3021.

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Cis and trans isomers of 3-(mono- or dialkylamino)-7-(methoxy or hydroxy)-1-phenyl-1,2,3,4-tetrahydronapthalenes were synthesized. Compounds HC- 11 (cis) and HT- 11 (trans) with 3- (dimethylamino) and 7-methoxy substituents and compounds HC- 13 and HT- 13 with 3- ((cyclopropylmethyl)methylamino) and 7-methoxy substituents were synthesized from their corresponding 3-(methylamino) and 7-methoxy derivatives (HC- 10 and HT- 10). HC- 10 and HT- 10 were previously prepared by reductive amination of the 3-tetralone and separated by fractional recrystallization. HC- 10 was obtained predominantly in a

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13

Kuniyoshi, Minoru. "Studies on phenyl-modified polysiloxane low-melting glass : preparation through sol concentration method and rapid heat treatment." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/136322.

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14

Plunian, Franck. "Étude de l'effet dynamo dans le coeur du réacteur Phenix." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0024.

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L'existence du champ magnetique terrestre ainsi que celui regnant dans d'autres objets astrophysiques (soleil, trous noirs, galaxies,. . . ) est explique par la theorie de l'effet dynamo. Ce phenomene est un transfert d'une partie de l'energie cinetique du fluide (electriquement conducteur) contenue dans le corps considere, en energie magnetique. Un phenomene analogue est susceptible d'apparaitre dans les reacteurs a neutrons rapides, a cause de la grande quantite de metal liquide (sodium) qu'ils contiennent. Le cur du reacteur phenix a fait l'objet d'une etude detaillee, dont les principaux r

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15

Mothapo, Mmaphefo Patricia. "Comparative evaluation of three fundamentally different analytical methods antioxidant activity determination with reference to bush tea (anthrixia phylicoides." Thesis, University of Limpopo, 2016. http://hdl.handle.net/10386/1517.

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Thesis (M.Sc. (Chemistry)) -- University of Limpopo, 2016<br>In this study, antioxidant activity methodologies were evaluated in terms of analytical performances. The total antioxidant activity from Athrixia phylicoides leaves (Bush tea) determined using 2,2-diphenyl-1-picrylhydrazyl radical scavenging (DPPH•) method, cupric ion reducing power (CUPRAC) method and cyclic voltammetry (CV). Folin-Ciocalteu method was used to quantify total phenolic content (TPC) in Athrixia phylicoides leaves. The influence of chemical and physical parameters on the total phenolic content and antioxidant activity

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16

Östlund, Lena. "Development of a Multiresidue Method for Analysis of Acidic Pesticides in Cereals with Liquid Chromatography-Tandem Mass Spectrometry." Thesis, Mälardalen University, School of Sustainable Development of Society and Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-9368.

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<p>A new method for analysis of acidic herbicides, mostly phenoxy acids and their esters, in cereals with liquid chromatography-tandem quadrupole mass spectrometry (LS-MS/MS) has been developed. Samples were hydrolyzed with sodium hydroxide in order to release covalently bound compounds followed by neutralization and finally extraction with acidified ethyl acetate. The extraction efficiency for both ester formulations and acids were studied. Acceptable results (70-120 %) were obtained for 2,4-D, dichlorprop, MCPA and mecoprop for both esters and acids. However, low recoveries were observed for

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17

Stojanovic, Jelena. "Determination of polyphenol oxidase (PPO) activity, anthocyanin contents and the phytonutrient changes in blueberry juice as influenced by different processing methods." Diss., Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-05292008-172900.

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18

Beelders, Theresa. "HPLC method development for the characterisation of the flavonoid and phenolic acid composition of rooibos (Aspalathus linearis) infusions." Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17818.

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Thesis (MSc Food Sc)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: Rooibos tea, produced from the endemic South African fynbos plant Aspalathus linearis, has various healthpromoting benefits which can largely be attributed to its phenolic composition. In this study, the reversedphase liquid chromatographic (RP-LC) separation of the principal phenolic constituents of aqueous rooibos infusions was optimised on conventional high-performance liquid chromatography (HPLC) instrumentation. The phenolic constituents comprised dihydrochalcones (aspalathin and nothofagin), flavones (orientin,

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19

Ross, Alastair Benjamin. "Alkylresorcinols in cereal grains : occurrence, absorption, and possible use as biomarkers of whole grain wheat and rye intake /." Uppsala : Dept. of Food Science, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/a417.pdf.

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20

Landberg, Rikard. "Alkylresorcinols as biomarkers of whole grain wheat and rye intake /." Uppsala : Dept. of Food Science, Swedish University of Agricultural Sciences, 2009. http://epsilon.slu.se/200911.pdf.

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21

Amann, Laura. "Development and Validation of an Analytical Method for Phenolic Acid Extraction from Cereals and Quantification using HPLC-UV." Thesis, Linnéuniversitetet, Institutionen för kemi och biomedicin (KOB), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-77227.

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Cereals are rich in phenolic acids, a group of secondary plant metabolites that are associated with reduced risk of chronic diseases. The objective was to develop and internally validate a method for extraction and quantification of phenolic acids in cereals using HPLC-UV and to apply this method for quantification of the content of phenolic acids in several species of Swedish cereals. Different procedures for extraction of phenolic acids from cereal grains using acid or base hydrolysis with and without subsequent enzymatic treatment were tested. Both the extraction procedure and the chromatog

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22

Khalaf, Eyada. "Phenolic-Linked Antioxidant and Anti-Hyperglycemic Properties of Selected Cereal, Pseudo-Cereal, and Millet Using In Vitro Screening Methods." Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/29281.

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Improving diversity of food systems by targeting whole grain cereals, pseudo-cereals, and millets is essential to enhance nutritional qualities beyond macro and micronutrient balance and to address emerging global food and nutritional security-linked public health challenges. However, human health relevant nutritional parameters of whole grains vary widely among species, genotypes, growing conditions, and further due to different processing methods. Therefore, it is important to screen human health relevant nutritional parameters of these whole grains prior to targeting them for wider public h

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23

Sheu, Biing-Jahn. "The synthesis and characterization by use of spectroscopic and x- ray methods of bromo, phosphine, and nitro derivatives of 13-phenyl- 1,4,7,10-tetraoxa-13-azacyclopentadecane." Virtual Press, 1992. http://liblink.bsu.edu/uhtbin/catkey/834528.

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The phenyl ring in the crown ether, 13-phenyl-1,4,7,10-tetraoxa-13-azacyclopentadecane (I), was used a site for functionalizing the compound. Electrophilic bromination of the ring with tribromide ion gave a 95% yield of the product substituted in the para position. This product underwent lithium-bromine exchange when reacted with n-butyllithium. The resulting anion was used to prepare PhZPX and PhPX2 derivatives, X p-C6H4NCH2(CH2OCH2)4&12 The oxide of PhZPX was completely characterized by an x-ray diffraction study which showed, in general, that the phosphorus was tetrahedral, the nitrogen pla

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24

Algi, Fatih. "Development Of Synthetic Methodologies Directed Towards The Generation Of Five Membered Ring Allenes." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607332/index.pdf.

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Chemists have always been fascinated by the cumulated diene system of allenes with its extraordinary properties such as the axial chirality of the elongated tetrahedron and a higher reactivity than non-cumulated C-C double bonds. The equilibrium geometry for an allene is linear with orthogonal pairs of substituents. An allene incorporated into a carbocyclic ring of nine or more carbon atoms is relatively unstrained. However, if the ring size is decreased, the linear perpendicular allene will be twisted and bent until, at some point, the energy gained by pi bonding in the two double bonds will

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25

Neirinck, Vincent. "Étude par RMN13C et 199Hg des états de condensation du noyau aromatique dans des structures lignines et dans leurs composés modèles : marquage au mercure de lignines d'extraction et de modèles monomères et polymères." Université Joseph Fourier (Grenoble ; 1971-2015), 1994. http://www.theses.fr/1994GRE10080.

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Ce travail a visé à une meilleure identification des unités condensées dans les structures lignines i. E. Des unités ou le noyau aromatique est lie au cycle et/ou à la chaîne propyle d'une autre unité phényle propyle. Ces structures clefs dans la structure polymère ont été moins étudiées que d'autres. Afin d'observer ces unités dans la structure lignine elle-même et non pas dans ses produits de dégradation, comme cela se fait traditionnellement, on a utilisé une sonde rmn, le mercure-199, par le biais de ses réactions de substitution électrophile sélective sur le noyau aromatique. Des échantil

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26

Riveli, Nowo. "Direct Photon - Hadron Correlations Measurement in Au+Au Collision at NucleonCenter-Of-Mass Energy of 200 GeV With Isolation Cut Methods." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1407292084.

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27

Huber, Klaus [Verfasser], and X. [Akademischer Betreuer] Cheng. "A multiscale method for mixed convective systems - Coupled calculations with ATHLET and OpenFOAM of the PHENIX NCT / Klaus Huber ; Betreuer: X. Cheng." Karlsruhe : KIT-Bibliothek, 2017. http://d-nb.info/1136021779/34.

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28

Schulze, Alexandra Elizabeth. "HPLC method development for characterisation of the phenolic composition of Cyclopia subternata and C. maculata extracts and chromatographic fingerprint analysis for quality control." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85773.

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Thesis (MScFoodSc)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: The phenolic composition of Cyclopia species is believed to be partially responsible for the numerous health promoting properties associated with their extracts. Current quality control measures do not accommodate variation in phenolic profiles of Cyclopia species. In this study, comprehensive high performance liquid chromatography (HPLC) methods were developed for the improved characterisation of the phenolic composition of aqueous extracts of two Cyclopia species (C. subternata and C. maculata). The methods were deve

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29

Undin, Torgny. "Development and improvement of methods for characterization of HPLC stationary phases." Licentiate thesis, Uppsala universitet, Analytisk kemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-166978.

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High Performance Liquid Chromatography (HPLC) is a widely used tech-nique both for detecting and purifying substances in academy and in the industry. In order to facilitate the use of, and knowledge in HPLC, character-ization of stationary phases is of utmost importance. Tailor made characteri-zation methods and workflows are steadily increasing the speed and accura-cy in which new separation systems and methods are developed. In the field fundamental separation science and of preparative chromatography there is always the need for faster and more accurate methods of adsorption isotherm determ

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30

Kaniová, Lenka. "Analýza šťáv vybraných odrůd černého rybízu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2015. http://www.nusl.cz/ntk/nusl-217158.

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The work deals with the chemical analysis of juices selected varieties of black currant (Ribes nigrum L.). The theoretical part is divided into three main chapters. In the first chapter there are short botanical characteristics of black currants, content of biologically active substances in fruit and utilization of black currant fruit in food industry. In the second chapter there are characteristics, importance and methods of determination of phenolic compounds. Vitamin C is describe in the last chapter, its characteristics, importance and methods of determination. Experimental part describes

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31

Hořavová, Lenka. "Spektrofotometrie přírodních látek – sekundárních metabolitů rostlin." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220060.

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Plants are an important source of secondary metabolites, such as substances that have a beneficial biological effect on the health of humans and they are irreplaceable in the modern medicine. They may operate in prevention and in the treatment of civilization diseases. In terms of content substances, the phenolic come to fore, especially polyphenols, which have been related to a number of overview studies due to their wide distribution and high concentration in plants. They also represent an important part of substances with redox effects present in the human diet and have an important role fo

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32

Adami, Fatos. "Analyse infra-rouge in-situ de l'interface electrode metallique/solution par la methode mirftirs : mise au point et application de la technique a l'etude de l'electropolymerisation des phenols sur electrode de fer." Paris 7, 1987. http://www.theses.fr/1987PA077042.

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33

Lacki, Karol M. "A novel method for the decrease of phenolic content in commercial canola meal using an enzyme preparation secreted by the white-rot fungus Trametes versicolor." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ28353.pdf.

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34

Spáčil, Zdeněk. "Mass Spectrometry of Biologically Active Small Molecules : Focusing on polyphenols, alkaloids and amino acids." Doctoral thesis, Stockholms universitet, Institutionen för analytisk kemi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-33233.

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The foci of this dissertation are on advanced liquid chromatography (LC) separation and mass spectrometry (MS) techniques for the analysis of small bioactive molecules. In addition to discussing general aspects of such techniques the results from analyses of polyphenols (PPs), alkaloids and amino acids published in five appended studies are presented and discussed. High efficiency and well understood principles make LC the method of choice for separating analytes in many kinds of scientific investigations. Moreover, when LC is coupled to an MS instrument, analytes are separated in two stages:

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35

Zhang, Wei. "Development of Photochemically Initiated Direct and Indirect Luminescence Detection Methods for Liquid Chromatography (LC) and Study of Aromatic Sulfonates and Phospholipids Using Reversed Phase Ion-Pair LC-Mass Spectrometry." Miami University / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=miami1068739487.

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36

Silva, Renan de Azevedo. "Desenvolvimento de software como ferramenta de confiabilidade para a análise da água subterrânea do IPEN." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-05112012-090907/.

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Neste estudo foi proposto o desenvolvimento de um software para automatizar o processo de estimativa da incerteza de medição pelo método descrito no Guia EURACHEM. Com a finalidade de testar a eficácia do software, foi desenvolvido um procedimento analítico para a determinação de compostos fenólicos na água subterrânea do Instituto de Pesquisas Energéticas e Nucleares a fim de se obter dados reais de um processo. Para tanto, a determinação dos compostos foi realizada por cromatografia gasosa acoplada ao detector de espectrometria de massas, GC/MS. Para garantir a qualidade dos dados gerados, o

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Khalil, Kamel. "Utilisation de bioindicateurs végétaux (lichens et tabac) dans la détection de la pollution atmosphérique de la région lyonnaise." Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10048.

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L'etude de la pollution atmospherique dans la region lyonnaise a ete basee sur les methodes de bioindication vegetale. Une etude diachronique de la vegetation lichenique a ete conduite permettant de comparer des resultats anterieurs (1984) avec les resultats de 1996. Des cartographies de la qualite de l'air ont ete etablies selon les methodes qualitatives d'hawksworth et rose (1970), van haluwyn et lerond (1986) et la methode quantitative (iap) de leblanc et de sloover (1970), qui ont mis en evidence, d'une part, que la qualite globale de l'air etait considerablement amelioree entre ces 2 peri

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38

Klatová, Kamila. "Stabilita a vlastnosti kombinovaných nápojů a ovocných koncentrátů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2018. http://www.nusl.cz/ntk/nusl-376828.

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This diploma thesis deals with the stability and basic properties of combined beverages and fruit concentrates. The theoretical part describes the production and use of fruit concentrates. Furthermore, the work deals with anthocyanic pigments and phenolic substances. The principle and instrumentation of liquid chromatography and electron paramagnetic resonance were described. In the next subchapter, the methods of determination of total anthocyanins and phenolic substances were described. The experimental part of the thesis described the determination of soluble solids, viscosity and antioxida

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HUYNH, SYLVIE. "Microcalorimetrie de la protonation : application a l'etude du metabolisme des derives nitroses." Caen, 1985. http://www.theses.fr/1985CAEN2020.

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Application de la microcalorimetrie a l'etude des derives nitroses qui suscitent un interet toxicologique certain et servent de substrat a des systemes enzymatiques qui les degradent et modifient leur activite

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40

Giada, Maria de Lourdes Reis. "Avaliação da capacidade antioxidante dos compostos fenólicos do cotilédone da semente de girassol (Helianthus annuus L.) rajada." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/9/9132/tde-22082017-093259/.

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No presente trabalho foi avaliada a capacidade antioxidante in vitro dos extratos do cotilédone da semente de girassol rajada, obtidos por extração seqüencial com solventes de diferentes polaridades, bem como avaliado o potencial antioxidante in vitro do extrato que apresentou maior capacidade in vitro. Todos os parâmetros in vitro (sistema β-caroteno/ácido Iinoléico, métodos FRAP, DPPH, ORAC e Rancimat) indicaram o extrato aquoso (EAq) como o de maior capacidade. Neste extrato, o ácido clorogênico (12,88%) foi identificado como o principal componente dos ácidos fenólicos. Na avaliação da

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41

Morgado, Filipa Patrícia da Silva. "Fenóis voláteis em vinhos tintos." Master's thesis, Universidade de Évora, 2009. http://hdl.handle.net/10174/18628.

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As leveduras Dekkera/Brettanomyces são responsáveis pela formação de fenóis voláteis em vinhos tintos, tornando-se numa grande preocupação para a produção enológica a nível mundial, devido à dificuldade em controlá-las. Os fenóis voláteis são responsáveis por aromas desagradáveis nos vinhos tintos, diminuindo a sua qualidade e resultando em grandes perdas económicas. Este trabalho teve como principal objectivo estudar um método de preparação de amostra e um método cromatográfico para analisar e quantificar os principais fenóis voláteis (4-etilfenol, 4-etilguaiacol, 4-etilcatecol, 4-vinilfenol

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42

Borel, Michèle. "Dégradation de composés benzoi͏̈ques par un pseudomonas du sol." Grenoble 1, 1987. http://www.theses.fr/1987GRE10086.

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La bacterie appelee gu5, isolee du sol, identifiee comme un pseudomonas, utilise les acides vanillique, isovanillique ou 4-hydroxybenzoique comme seule source de carbone et d'energie. L'acide protocatechuique a ete identifie comme intermediaire commun du catabolisme de ces substrats. La demethylation des acides vanillique et isovanillique est realisee par deux systemes enzymatiques distincts. Ces reactions de demethylation n'ont pu etre observees dans les lysats bacteriens. La 4-hydroxybenzoate 3-hydroxylase, nadph dependante a ete purifiee et etudiee. C'est une enzyma flavinique contenant du

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Nel, Anton Pieter. "The influence of different winemaking techniques on the extraction of grape tannins." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6872.

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Thesis (MScAgric (Viticulture and Oenology))--University of Stellenbosch, 2011.<br>Includes bibliography.<br>ENGLISH ABSTRACT: Grape and wine phenols consist of flavanols which is the building blocks for tannins. These building blocks are called monomers which consist of catechins, epicatechins, epigallocatechins and epicatechin-gallate. Tannin is important in wine as it contributes to bitterness, mouth feel (astringency) and maturation potential of the wine. Futhermore it has a health benefit as an antioxidant. Anthocyanins are responsible for the colour of red wine. The anthocyanins com

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Meak, Pramol. "Biochemische Charakterisierung von Pflanzen unterschiedlicher Nutzungsintensität zur Ableitung von Parametern für die Ermittlung des energetischen Futterwertes." Doctoral thesis, Humboldt-Universität zu Berlin, Landwirtschaftlich-Gärtnerische Fakultät, 2002. http://dx.doi.org/10.18452/14761.

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Die exakte Bestimmung des energetischen Futterwertes von Grünland ist für die Praxis von großer Bedeutung. Das am häufigsten angewendete Schätzverfahren auf Basis der chemischen Analyse ist für Grünlandbestände mit geringer Nutzungsintensität nicht anwendbar. Ziel der Arbeit war es zu prüfen, ob andere ausgewählte Zellwandparameter (Xylose, Arabinose, pCA, FA, säurelösliches Lignin, ADL:Gesamtlignin) über ein breites Nutzungsspektrum eine engere Korrelation zur Verdaulichkeit der OS haben als die Rohfasergehalte, auf deren Korrelation zur in vivo Verdaulichkeit die Schätzgleichungen auf Basis

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Chgoura, Mohammed. "Adsorption par des charbons actifs de molécules organiques à partir de solutions aqueuses." Aix-Marseille 1, 1987. http://www.theses.fr/1987AIX11082.

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Vezzoli, Massimiliano. "Intrinsic kinetics of titania photocatalysis : simplified models for their investigation." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/51574/1/Massimiliano_Vezzoli_Thesis.pdf.

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Even though titanium dioxide photocatalysis has been promoted as a leading green technology for water purification, many issues have hindered its application on a large commercial scale. For the materials scientist the main issues have centred the synthesis of more efficient materials and the investigation of degradation mechanisms; whereas for the engineers the main issues have been the development of appropriate models and the evaluation of intrinsic kinetics parameters that allow the scale up or re-design of efficient large-scale photocatalytic reactors. In order to obtain intrinsic kine

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Hilgemann, Maurício. "Avaliação da capacidade antioxidante in vitro e in vivo contra radicais peroxila e hidroxila em amostras de plantas medicinais." Universidade Federal de Santa Maria, 2010. http://repositorio.ufsm.br/handle/1/4191.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>The present work reports the development of new methodologies to evaluate the in vitro and in vivo antioxidant capacity against peroxyl and hydroxyl radicals in five medicinal plant samples (Matricaria chamomilla L., Psidium guajava, Achyrocline satureoides, Baccharis genistelloides and Cymbopogon citratus) and seven phenolic compounds (rutin, quercetin, resveratrol, gallic acid, ferulic acid, caffeic acid and rosmarinic acid). The antioxidant capacity of the samples was analyzed by two independent methods. In the first one, a ne

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Marouani-Keraghel, Saïda. "Reduction electrochimique de composes d'uranyle en milieu organique." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13175.

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Etude de la reduction chimique de sels (nitrate et acetate) d'uranyle et des complexes (phenyl-1 methyl-3 acyl-4 pyrazolones-5) et beta-cetophosphonates d'uranyle en milieu organique et en presence de perchlorate d'ammonium sur une electrode de mercure

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顧得祥. "Studies of The Methods For Synthesis of alpha-Amino Acids― Preparation And Application of (R)-6-(4-Methoxy-phenoxy- methyl)-3,6-dimethyl-5-phenyl-3,6-dihydro-[1,4]oxazin-2-one." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/65997809469815054987.

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碩士<br>國立中興大學<br>化學系<br>91<br>This thesis describes our studies on the asymmetric synthesis of alpha-amino acids utilizing monocyclic iminolactones as chiral templates. Chiral auxiliaries 17 and 35 were prepare in three and five steps with the overall yield of 60 % and 53 % respectively. The stereocenter was established by employing Sharpless asymmetric dihydroxylation to furnish compounds 16 and 32 with 94 % and 96 % entiantiomeric excess (e.e.) respectively. No recemization of compounds 17, 35 during the transformations was observed. When alkylation of chiral template 20 was carrie

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LIAO, JIN-YI, and 廖晉翌. "A phenol-based method for production of L-DOPA." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/78328065310923294688.

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